Publisher Square Enix and developer Artdink have released the version 1.1.0 update for Triangle Strategy, which adds chapter and story battle replay features, an extra chapter, and more.
Really cool to see an update like so late, but I got so close to the end and just stopped playing (a bad habit with many games I play). I feel like I'd need to start over now.
The game has multiple paths, multiple endings and a pretty robust new game+ mode (not only does everything carry over, but difficulty continues to scale up). Multiple playthroughs are required to experience everything.
Depending on how far in you are it might be worthwhile to finish your old playthrough (even if it requires a guide or something to get yourself back on track) and reach new game+ instead of restarting.
I am a patient gamer (with some exceptions). Shiny new games are always going to be there, so I prefer to go through games at my own pace, and then get a new game when I finish a old one, or drop it for some reasons.
Sometimes you do want to start a new game though, without finishing an old one. Depends on the mood, and the game you are playing.